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Comparison between greyscale US, CEUS and CDUS regarding the appearance of a solid tumor (indicated by a blue arrow). (A) On greyscale US, the tumor appears as an echogenic protuberance of the bladder wall. (B) The same mass shows a strong early enhancement after SonoVue injection, highly suggestive of malignancy. (C) CDUS shows vascularity mostly to the base of the lesion, raising suspicion for malignancy but less clearly than CEUS [34].
